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COROT TARGETS: PROGRESS REPORT ON THE PHOTOMETRIC AND SPECTROSCOPIC MONITORING OF DSCT, GDOR AND BCEP VARIABLE STARS.

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Presentation on theme: "COROT TARGETS: PROGRESS REPORT ON THE PHOTOMETRIC AND SPECTROSCOPIC MONITORING OF DSCT, GDOR AND BCEP VARIABLE STARS."— Presentation transcript:

1 COROT TARGETS: PROGRESS REPORT ON THE PHOTOMETRIC AND SPECTROSCOPIC MONITORING OF DSCT, GDOR AND BCEP VARIABLE STARS

2 In summer 2004 it has been possible to start the target characterization. Several observing runs in photometry Sierra Nevada Summer 2004 P. Amado and S. Martin S. Pedro Martir Summer 2004 E. Poretti Sierra Nevada Winter 2004-05 P. Amado and S. Martin S. Pedro Martir Winter 2004-05 M. Alvarez and E. Poretti APT Winter 2004-05 W.W. Weiss Mercator Summer 2005 C. Aerts and coll. Piszkesteto Summer 2005 M. Paparò and coll. Sierra Nevada Summer 2005 S. Martin S. Pedro Martir Summer 2005 M. Alvarez S. Pedro Martir Winter 2005-06 E. Poretti and. M. Alvarez S. Pedro Martir Winter 2005-06 E. Michel and STEPHI coll. Sierra Nevada Winter 2005-06 S. Martin and E. Rodriguez

3 Positions of the DSCT+GDOR targets in the CMD 1HD 44195 GDOR+DSCT 2HD 181147 DSCT 3HD 50870 DSCT 4HD 170782 DSCT 5HD 170699 DSCT 6HD 44283 DSCT 7HD 172189 EA+SB2+DSCT 8HD 181555 DSCT (revised) 9HD 49434 GDOR 10HD 171834 GDOR 11HD 180642 BCEP 12HD 170580 BCEP (Poretti et al. 2005, AJ 129, 2461)

4 NOVEMBER 2003 (8 nights)JANUARY 2005 (4 nights) HD 44195, the hybrid GDOR + DSCT star v sin i = 58 km/s, in the field of HD 43587, f 1 =20.48 c/d NOVEMBER 2005 (6 nights) The DSCT variability seems to be monoperiodic, The GDOR variability seems to be multiperiodic

5 HD 44283, multiperiodic DSCT variable, small v sin i (19 km/s), evolved (?) 15.00 c/d, predominant mode (ampl. 0.014 mag in v) Second term, f=9.62 c/d, ampl. 0.005 mag in v ) Asteroseismic peaks in the 10-25 c/d range, ampl. < 0.003 mag in v)

6 The field of HD 43587: asterosesismic orientation of the pointing 1.0 solar mass star, MS Target currently in the short list STARE CCD photometry S. Pedro Martir uvby photometry Sierra Nevada uvby photometry Mercator, APT, SAAO contributions 1 HD 43021 V=7.82 ZAMS 11 c/d, 80 km/s 2 HD 44283 V=9.29 zigzags 15 c/d 19 km/s 3 HD 44195 V=7.57 ZAMS hybrid GDOR+DSCT 58 km/s 5 Red variable 6 Hipparcos variable 7 GSC00144-03031 DM HADS V=10.2 Be : HD 43285, V=6.07

7 HD 49434, confirmation of the light variability High precision photometry (s.d. better than 0.002 mag) on four consecutive nights. Peak-to-peak amplitudes 0.022 mag in violet 0.019 mag in blue 0.016 mag in yellow Multiperiodicity probable. The observations planned in December (OSN and SPM) will be decisive to detect periodicities. Additional APT timeseries available.

8 HD 50870, a DSCT star in the field of HD 52265 f 1 =17.15 c/d f 2 =14.00 c/d ………. Slow rotator, V eq sin i = 17 km/s Predominant mode STEPHI campaign in November 2005

9 The positioning of HD 58070 could be a critical item HD 52265 and HD 58070 are located on the edges. There are three Be stars close to HD 58070

10 HD 172189, orbital period has been detected: 5.702 d. Eccentric orbit with only one minimum. DSCT pulsation: frequencies in the 18-20 c/d interval. (Martin et al., 2005, A&A 440, 711) The RV curve has been the goal of successful spectroscopic observations in past summer (OHP, SLN, ESO). Target of a STEPHI campaign in 2004.

11 HD 180642, Beta Cep variable, but probably not a multiperiodic one Monitored at SPM and OSN in Stromgren photometry, with Mercator telescope in the Geneva system and and with M. Piszkesteto telescope in V filter Pulsational frequency term identified as the Fundamental radial mode (Aerts et al., in preparation)

12 Reminiscent of the case of BW Vul (Sterken and coll.) HD 180642, Mercator and Mt. Piszkesteto light curves in V light BW Vul

13 HD 44195 hybrid HD 43587 f=20.5 c/d f< 5c/d 7.56 F0 58 km/s HD 50870 DSCT HD 52265 f=17.5 13-15 8.88 F0 17 km/s HD 44283 DSCT HD 43587 f=15.0 10-25 9.29 F5 19 km/s HD 181147 DSCT HD 181555 f=15.4 14-17.5 c/d 8.74 A5 98 km/s HD 170782 DSCT HD 170580 13-25 c/d 7.81 A2 197 km/s HD 170699 DSCT HD 170580 10-15 c/d 6.95 A3 >200 km/s HD 172189 DSCT HD 171834 17-19 c/d EA +SB2 8.85 A2 48 and 75 HD 181555 DSCT primary target 8-18 c/d 7.98 A5 170 km/s HD 49434 GDOR photometric variability CONFIRMED 5.75 F1 90 km/s HD 171834 GDOR no photometric variability 5.43 F5 72 km/s HD 180642 BCEP HD 181555 f=5.49 c/d, standstill 8.29 B1 37 km/s HD 170580 BCEP no photometric variability, multiple system 6.68 B2V Target Type Field Frequencies V Sp V sin i

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